Drill Bit Types

Heavy Duty Jobber
Black & Gold Jobber
Black & Gold Mechanics Length
M-2 high speed alloy; black oxide coating to reduce friction;
135 degree split tip
M-2 high speed alloy; black oxide/gold coating; jobber length;
135 degree split tip
M-2 high speed alloy; black oxide/gold coating; shorter than jobber length; 3 flats on shank to prevent slipping in chuck;
135 degree split tip
Screw Machine
M-2 high speed alloy; black oxide coating to reduce friction;
2/3 of jobber length drills, also known as "Stubbies"; 
135 degree split tip
Cobalt
M-35 high speed cobalt steel; high heat and abrasion resistance;
135 degree split tip
Titanium
M-2 high speed alloy; 80 Rockwell C Titanium Nitride Coating; capable of drilling aluminum;
135 degree split tip

Split-tip prevents "walking," easier penetration and extended life.

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